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<h2>DAS version 1.53E</h2>

<p>

The DAS protocol has been originally designed with mainly sharing of genomic data in mind.
Several extensions to the DAS-specification have been introduced over the last years which 
add support for other types of biological data. Here these extensions are bundled together
and form the version 1.53E (E for Extended) of DAS.
</p>

<p>
DAS 1.53E is fully backwards compatible to 
<a href="http://www.biodas.org/documents/spec.html">DAS 1.53</a> 
and contains the following add-ons:
</p>

<h2>New DAS commands</h2>
<ul>
<li><a href="extension_sources.jsp">sources</a> - the <b>sources</b> meta command to describe DAS sources. </li>
<li><a href="extension_alignment.jsp">alignment</a> - the <b>alignment</b> extension allows to share alignments of protein sequences, structures and chromosomes.</li>
<li><a href="extension_structure.jsp">structure</a> - the <b>structure</b> extensions allows to share 3D structural coordinates.</li>
<li><a href="extension_interaction.jsp">interaction</a> - the <b>interaction</b> extension allows to specify molecular and protein domain interactions.</li>
<li><a href="extension_volmap.jsp">volmap</a> - the <b>volume map</b> extension allows to share volum map data</li>
</ul>

<h2>Variation of existing DAS commands</h2>
<ul>
<li><a href="extension_genedas.jsp">genedas</a> - the <b>GeneDAS</b> extension.</li>
<li><a href="extension_maxbins.jsp">maxbins</a> - restricting the maximum number of <i>features</i> returned by a DAS server.
</ul>
 

<h2> DAS stylesheet conventions </h2>
<p>
The DAS stylesheet response is quite inconsistently used. We adopted several conventions to ensure consistency between clients:

</p>

<ul>
<li><a href="extension_stylesheet_histogram.jsp">histogram stylesheets</a> - How to define stylesheets for Histogram style data.
</li>
</ul>

<h2> DAS - annotation type ontology </h2>

<ul>
<li><a href="extension_ontology.jsp">Ontology extension</a> - Use an Ontology in the DAS - features and types responses.</li>
</ul>


<h2>Time stamps</h2>

Where timestamps are being used, the following convention is being used:
<ul>
<li><a href="extension_timestamp.jsp">DAS timestamp convention</a></li>
</ul>


<h2>Implementation</h2>

We are providing support for these extensions through our Perl and Java DAS server libraries.
Please see the <a href="help_servers.jsp">pages about DAS server libraries</a> for more information.

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